Automatic stop mechanism for talking machines



I ay-29, T1923. 11,456,589

. A; EBNER AUTOMATIC STOP M cHA-mtsM FOR TALKING MACHINES Fi ledseni. 14', 1920 .2 Sheets-Sheet 1 May. 29,1923.

A. EBNER AUTOMATIC STOP MECHANISM FOR TALKING MACHINES Filed Sent. 14, 1920 ZSheeta-Sheet 2 Patented May 2%, i923.

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AUTOMATIC sror Mncnnnrsar FOB, TALKING maonm'ns.

Application filed September 14,1920, SeriaL No. 410,332.

To all whom it may concern:

Be it known that T, A BERT EBNER, a citizen of the German Empire, residing. at Stuttgart, Wurttemberg, Germany, have invented certain new and useful Improve ments, in Automatic sto rMechanism for Talking Machines, of which the following is a specification. 1

In order that it may not be necessary in talking machines to watch for the end of a record for the purpose of removing the needle from the last groove devices have been suggested which stop the talking machines automatically by means of electric contacts. The known devices of this kind however, are troublesome alike in their structure as in their working, so that disturbances in the working easily occur.

This invention relates'to a device, which is distinguished by its great simplicity in every respect, Works perfectly reliably, and moreover has the advantage of being adjustable. c

The invention consists substantially in the circuit of the driving motor being automatically interrupted by the'intermediate circuiting of a suitably formed contact device in that position of the sound arm in which the needle is in the last groove of the disc. Through the turning of the sound arm with the needle inwards a contact moves on a contact strip, the end ofwhich is so arranged or can be so placed, that the contact slides off the strip, as soon as the needle of the sound armis in the last groove of the disc. I

Now in order to eifect a sudden interruption of the contact, the sliding contact device is constructed as a levercontact device, in connection wherewith. the current-is interrupted by putting the contacts apart. The contact lever lies ordinarily on a free contact and is removed by the. sound arm at the moment when its needle has reached the end of the grooves in the record. The lever is suitably formed with a bend that lies in the path of the sound 'arm or of an extension of the same. When the sound-arm has been turned back into the starting position the contact leverreturns at once into the contact closing position, in connection wherewith however the current is suitably switched on by a special switch situated in thecircuit.v i

The adjustment for the commencement is turned round without furtherv trouble in this bell 4 in the form ofconstruction shown efi'ected precisely as with the sliding contact device. The arrangement so that injury to the disengaging or stop ping device is avoided, as frequently hapcan be improved further pens through unskilfulness or inattention since the contacts which come on to the .The improvement consists in the for 'nof the contact-piece which is actuated'by the sound arm, for the purpose of interrupting the current, allowing the disengaging pin or other are damaged if too great force is used.

the like arranged on the sound arm to be carried over the contact piece and notwithstanding to actuate the latter, as the coning surface for the pin or the like of the sound arm, which, when running on to this surface, breaks the circuit by turning the contact piece and then, as the soundarm tact piece is furnished with an oblique slidfurther rotates, slides away over the contact piece. If the contact'piece be sloped also on the other side, the device can be employed after the contact device has been the same manner as for sound discs inwhich the grooves run in the opposite direction. The object of the present invention is shown in the drawing in different forms by way of example, I 1

Fig. 1' is a side elevation" of the new arrangement of the one form of construction partly in vertical section. Fig. 2 is a plan as seen when the action begins. Fig. 3 a partial elevation, partly insection, of a second form of construction.

Fig. 4; an under-plan of the interrupting device. f

Fig. 5 is the plan of the contact device again of a different form of construction.

arm 3, and can be rotated around a shaft 5.

The bell is arranged with suchfriction that p it remains stationary in any position of rotation. The rotation itself is facilitated by a roughened surface 6 for holding the bell formed in the upper part as ahead 7. In

in" Figs. 1 and'2 is a current conducting piece '8; which iis constructed as; segment and "is formed "as 'po'rtion of a circl'estruck I" from the axis of the bell 4, as shown in Fig. 2.. This segments is jcondu'ctivelycon- .nected withltheicalole through a conduc- 9 c aii rben r ang da hi s pre sed y a spring l3'aga1nst the segment 8 and the i 2 under surfaceof the b611 1; The conductive vhg l'dero11' socket 14; of the sliding carbon 12 is, in "conductive connection. with the other cable 15,.sothatthecurrent is switched on and the motor runs, as soon asithe carbon visiongthejsegn'lentl 8,-and as'lolng as it/ runs thereon. vh The-"length of the segment 8, as well as its starting 'and end points areg'arranged in relation to the carbon 12 in suchamanner that the latter runs ldown frointhe Segment andfis pressed against the lower surface of groove more orgless far in, an adjusting de-.

vicelisprovidech by which the carbon '12 and therewith the sound arm 2 can be given the 1' rightposition i-I1 ielation to the end of the segmentsil Forthis purpose onthe bell is a notch 17 andon the sounddarm 2 a pointer 18 whichatthe sametime can form-.the'baseplat'eof thecarbon holder 14. The notch 17 has such'a position in relation to th'e end of theysegment 8;that the carbon 12 runs down from this, if the notch 17 and pointer 18 coincide, k Y

"Befor'eithe beginning oifthe reproduction vof a ,piece. of. music the. needle, is inserted in theflast groove of the sound disc and the bellthenrotated until the notch 1,7 coincides with the pointer 18Q (A Y Thesound arm,2 is now turned back and if necessary inserted in the extreme outside groove in the disc. With suitably long segment 8 theoarbonf12 is then on the segment 8 andthe current is thereby switched 011.

{According to the length of'the piece of music f amore or less long course of the segment 8 is run over by the carbon 12 in thisway u'n'tilfthe current is switched off; in connection wherewith ach tim'ethe end of the same is brought into,

'i fi th i a d, Op ra e sw ch o y I o ve-in the disc.

a I; suitable construction is further introduced into the circuit, and means thereof the the bell consistingfo f insulating material, when the pieceof 111L1SlC C OfijiGS to an end, I thatis to say whenthe-needle is in the last,

coincidence with the I last circuit can be a second time interrupted or closed. Inorder to set the arrangement in action, the second switch is then put in circuit and the sound arm then only moved against the disc, whereby the sliding carbon optional",@;in whate'ver manner "the rontact device imay'be otherwise formed. a

In. the form of construction accord ng .to

The

Fig. 5a contact lever 20 is arranged on the segment tlandso as to pivot around a pin 19,, This lever. which is'in ,con ductivelconnection with the segment 8 isffronstantly pressed by a spring 21] against a contact piece 22,. which is connected with the i source or current through a" conductorj15; The two contacts 23 then' lie one on the other, So that :the circuit is closedqandjthe sound disc rotates-Q Onto the, Contact leverl2'0, which is furw nished v for the purpose with a standing "off arm 24;,"the sound arm 2 now comeswith the assistance of a suitable insulated extensiolr 25, whereby the circuit is interrupted and the apparatus stopped. I By suitable adjnstment of'the parts this shuttingor switching off thatis to say the coniing of thes ndm 2 on to the oontactlever 20 occurs atthe' inoment when. the piece oi music is played to th g -v fln'the form of construction shownin Figs Grand? the contact lever ;20"isxarranged topivot around aflhorizontal, shaft 19 and presses against a secondsegment '22, which takes the place of the'contact'p ece 22 in the form show n in Fig. 5;

The form of constructionlaccdrding to Figs. 5 and employs a contact leyer' 20, which is'provided with an enlargedportion or cam 26 for engagement with the switching-oif pin 25 'orth like arrangedpn the sound 2111112 and is vso arranged that. the

pinf25 slides across th e proininentlportion ofthe cam and 'pressesthe leverinwardly to separate the contacts 23. It'is po'ssibleito'r the pin 25 of the soundarm 2'to move past P e e 20;

the ca1n26 on to the others'ide ofthe contact adapt the device for use 'in connection of the disc, instead of inwardly; both sides ;of the cam '26 are correspondinglyinclined "for cooperation with the pin 25 of the sound 2111112, regardless of the direction of'movement ofth'e latter;

wa ds the other Side; p r .v I claim i c j machines of the electric motor'driven t'ype In the latter "case the belle metered-rewith discs or recordsby which the tone arm 2 is' fedoutwar'dlyiwith relation to the axis other rasaese equipped with a movable tone arm, contact members adapted to be interposed in the electric motor circuit, one of said contacts being actuated by the tone arm, means permitting adjustment of the other contact whereby the moment of separation of the contacts may be varied according to the position of the end of the sound groove in the record, and indicating means facilitating correct adjustment of the adjustable contact to effect separation of the contacts at a predetermined point with respect to the sound groove in the record.

2. In an electric motor stop device for talking machines of the electric motor driven type equipped with a movabletone arm, a pair of contacts adapted to be interposed in the electric motor circuit, one of said contacts being actuated by the tone arm to effect its separation from the other contact, and a rotatably mounted support for the contact mounted for adjustment whereby the moment of separation of the contacts with respect to the position of the tone arm may be varied according to the length of the sound groove in the record.

3. In an electric motor stop device for, talking machines of the electric motor driven type equipped with a movable tone arm, a contact member carried by the tone arm, asecond contact engageable with the first contact, said contacts being adapted to be interposed in the electric motor circuit, and a rotatably adjustable support for the second contact having its aXis of rotation coincident with the axis of movement of the tone arm whereby the moment of separation of said contact may be varied with respect to the position of the tone arm according to the len th of the sound groove ina record,

f In an electric motor stop device for talking machines of the electric motor driven type equipped with a movable tone arm, a pair of contacts adapted to be interposed in the electric motor circuit, an adjustable support for one of the contacts the other contact being actuated by the tone arm, and means on the tone arm for indicating the position of the contact member actuated "thereby with respect to the adjustable contact member.

In an electric motor stop device for talking machines of the electric motor driven type equipped with a movable tone arm, a pair of contacts adapted to be interposed in the electric motor circuit, a lever supporting one 01"- the contacts, means carried by the tone arm for actuating said lever to disengage the contact member carried thereby from the other contact member, and an adjustable support for said other contact memher for varying its position with respect to the first mentioned contact member.

6; In an electric motor stop device for talking machines of the electric motor driven type equipped with a movable tone arm, a pair of contact members adapted to be interposed in the electric motor circuit, an adjustable support for one of said contact members, a lever supporting the other contact member and normally maintaining the latter in engagement with the first contact member, and means attachable to a tone arm for engaging and actuating said lever during movement of the tone arm in either direction.

In testimony whereof I hereby aflix my signature in presence of two witnesses.

ALB. EBNER.

Witnesses HILDEGARD Icnnrenn, BUnoLr 1312120111. 

